Loosely associated; of limited relevance except indirectly; only accidentally related.
Entering or approaching, prior to reflection (more frequently incident).
Occurring by chance.
Existing tangentially, being a byproduct, a tangent, or a likely consequence.
Something that is incidental.
Minor items, not further defined. Incidental expense.
Indirect; suggestive; not straightforward.
Slanting or sloping; oblique.
Directed to the side; sideways.
Along the side of something.
obliquely
Towards the side; sideways.